In this study, we propose a district classification method on Tokyo 23 wards, for introducing a cogeneration system as a normal-and-security system for emergency (security), energy conserving and power peakcut effect. As the result of this study, 1) 64 representatives are classified by cluster analysis into 6 groups respectively, at first, in terms of essential power demands for security and essential power demands degree for security which means the ratio of essential power demands for security to maximum power demands for normal. And second, in terms of energy conserving and power peakcut effect. 2) Through a case study for some districts representing each clusters, energy conserving, power peakcut, and active ability in emergency are confirmed. 3) For Tokyo 23 wards, the most considerable districts for introducing a cogeneration system are located on Yamanote Line, especially on Tokyo station, Otemachi, Ikebukuro, Sinjuku, Shibuya and Hamamatucho area.
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